In vivo and in vitro evidence of an adenosine-mediated mechanism of calcium entry blocker activities.

Abstract:

:Drugs such as dipyridamole (200 micrograms/kg/min), an adenosine uptake inhibitor, and theophylline (300 micrograms/kg/min), an adenosine receptor antagonist, respectively increased and decreased postischemic hyperemia in normal subjects, as well as in POAD patients. Moreover, dipyridamole pretreatment was able to antagonize the reduction of peak flow induced by nifedipine, and the potentiating effect of flunarizine on postischemic hyperemia was affected significantly by theophylline, thus suggesting a possible interference of calcium entry blocker drugs with the endogenous adenosine system. In a cellular model (polymorphonuclear leukocytes--PMN) the inhibitory effect of calcium entry blockers on stimulated functions (degranulation and free radical production) was highly antagonized by theophylline. Finally, a 1H-NMR spectroscopy study showed a binding interaction between adenosine and flunarizine on the cell membrane. An adenosine-receptor coupling to the calcium entry blocker channels is suggested.

journal_name

Angiology

journal_title

Angiology

authors

Di Perri T,Pasini FL,Pecchi S,De Franco V,Damiani P,Pasqui AL,Capecchi PL,Orrico A,Materazzi M,Domini L

doi

10.1177/000331978904000307

subject

Has Abstract,Author List Incomplete

pub_date

1989-03-01 00:00:00

pages

190-8

issue

3

eissn

0003-3197

issn

1940-1574

journal_volume

40

pub_type

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